I was flying today, and the motor on my EZ Star suddenly screeched and stopped

Took it home and dismantled (Oh yes, sheared off 3 of the four M3 motor mount screws - my threadlocker is too strong, or I am using too much of it)

The circlip was missing. Found it inside the motor, mangled like a chakli, and stuck to one of the magnets. Removed the same, now the motor rotates free and easy

Any similar experience anyone? Probable cause?

I lost a circlip in a crash...the plane came down like  a missile..got hit at the nose..

Any idea how it came off?